1 Division of Respiratory and Allergic Diseases, Department of Chest Diseases High Speciality, A.Cardarelli Hospital, Napoli, Italy.
2 Medical School of Respiratory Diseases, University 'Federico II', Naples, Italy.
3 Department of Medicine and Surgery, University of Salerno, Salerno, Italy.
4 First Division of Pneumology, High Speciality Hospital 'V. Monaldi' and University 'Federico II' Medical School Naples, Naples, Italy.
5 First Division of Pneumology, High Speciality Hospital 'V. Monaldi' and University 'Federico II' Medical School Naples, Naples, Italy. [email protected].